Fitting-table heater



Jan. 3, 1928.

E. J. OVING'TON FITTING TABLE HEATER Filed Feb. 5. 1926 2 Shegts-$heet 1u! w a im w Jan. 3, 1928.

E. J. ovmca'rbu FITTING TABLE HEATER Filed Feb. 5. 1926 2 Sheets-Sheet 2lit) ' tening the zylonite.

Patented Jan. 3, 1928.

EDWA D J'. ovmeron, or AUBURNDALE, MASSACHUSETTS.

' FITTING-TABLE HEATER.

Application filed February 7 The developement pf the zylonite spectacle,frame as a substitutefor bone'and shell ias required new methodsand new,devices for bending and shaping the material to fit it'to the wearersface. Zylonite is a cellulose compound and is softened by heat, but inorder to obtain the best results in bending and shaping such an articleas a zylonite spectacle frame to fit the human features, the applicationof the heat to the various parts ofthe frame must be localized atcertain parts of the frame to permit a sharp bending andshaJingatthesepoints, andmusa be widely distributed at'other parts of the frame whichrequire a long, slow curving bending or shaping.

Various expcdients have been devised for this purpose. The parts of theframe to be softened have been placed in boiling water and then shaped,or they have been placed over acandlc flame, a small alcohol flame, orother crude source of heat. l'Vhere electricity has been used, ithasbeen the common practice to construct a truncated cone on a smallround or. square toaster or electric grid so that the rising heated airpassing through the small opening at the top of the cone may be utilizedfor the purpose of sof- All these expedients are open to the objectionthat they do not permit that combination of heat localization and heatdistribution demanded by thepeculiar character and shape of the articlebeing treated. a

To the end, therefore, of avoiding the ob jections existing in earliertypes and methods while at the same time providing a heater which willcombine the essentials above pointed out, I have deviscdmy presentinvention. According to it, the heater is constructed and arranged topermit a decidedly localized application of the heat at certain parts ofthe frame and a wide dis-; ribution of the heat at other partsof theframe, as conditions require.

In carrying out my invention, I construct the heater itself as a unit ofdouble purpose and result. In one area, it is arranged to produce athin, narrow strip of rising heated air bounded and concentrated on itsedges by an ascending column of cool air carried along by the heatedair. This narrow strip of heated air supplies the concentrated orlocalized heat as above. In another area,

5, 1928. Serial No. 86,158.

the heateris arranged on a totally different principle, namely, there isno appreciable rising column of heated air, the air being stopped fromascending into the heater by abafile plate which acts on its under faceas a baffle and on its upper surface as a radiant heat reflector. Inthis manner, over this area of the heater, a circular or substantiallycircular hot area of'wide distribution is provided in which largerportions of the frame, as for instance, the rim or perhaps the curve inthe bow of the spectacle frame may be evenly heated. At the juncture ofthese two main areas of the heater, there exists a hot spot, whichresults from the peculiar physical relation of the two areas to eachother. This hot spot is used where a small amount of intense heat mightbe required to m my soften heavy parts of the frame, such as thenose-piece or the butt piece where' the temple oins the rim. These andvarious other features of advantage which will appear more particularlyhereinafter are so cured in the heater described and illustrated in the"accompanying specification and drawings, throughout which likereference characters are employed to indicate corre sponding parts, andin the drawings:

Figs. 1 and 2 are side and plan views, respectively, of a selectedembodiment of my heater which Well illustrates the principles involved.i

Fig, 3 is a section on the line 33 of Fig. 1. i

Figs. 4: and 5 are sections on the lines 4:. 4: and 55, respectively, ofFig. 2.

Fig. G is a detail view of the combined battle and reflector unitremoved.

. Fig. 7 is a fragmentary plan view partitween the narrow sheet ofconvected heated air and the substantially circular column 01 radiantheat.

My heater comprises a base 1 and a superposed. shell 2 suitablyconnected thereto. The base is footed to permit a circulation of airbeneath it and in use preferably rests upon a footed insulator 3 restingon the fitting table l.

In plan View, the heater shell preferably has the banjo shape shown inFig. 2. This type of shell has pronounced advantages in that the rims orround portions oi the zylonite frames can be softened over the circulararea of the shell, and the other parts of the frame can be soilitenedeither lengthwise or crosswise over the rectangular part 6 of the shell,the parts 5 and 6 at their juncture defining a relatively limited areawhich I shall designate as a hot spot 7 and where. the heat isconcentrated to maximum intensity. The top of the shell is perforated,as best snown in Fig. 2, and the base of the shell is also open, asindicated at 8 and 9 in liig. el.

Mounted within the shell and suitably insulated therefrom is a coiledresistance wire Vt. As here shown, the wire 1V is carried by aninsulator ol. inica or other appropriate material it), which extendstl'n'ough the elongated part (3 of the shell as a narrow strip 11 and atthe cicular.

Spacing ol the wire in the coils closer or further apart depending uponwhether a greater or less intensity of heat is desired at certainpoints.

lVithin the circular part 5 of the shell. the ends of the resistancewire are carried beneath the heads or a pair of binding screws 13 whichare set through an insulated block i l mounted on the circular wall 5 ofthe hell, and the lead wires 15 from the currcit source are carriedthrougl'i the base and "fastened by said screws in electrical contactwith the ends of the resist ance wires.

Set within the circular shell 5, between the lower edge oi? the micainsulator 12 and the top edge ol the base 1, is a combination reflectorand ballle plate 16 which is peripherally notched, as indicated at 17.The purpose oi this member 16 two-told. As a balile, it deflects the airrising through the aperture 53 and directs it through the notch l7 sothat the air passes through the s called hot spot T (Fi T) existing atthe juncture of the circular part 5 with. the rectangular part 6 ol theshell. As a reflector, it reflects the radiant heat thrown oil by theresistance wire at the square portion 12 of the heat unit.

The double action of the member 16 is illustrated diagrannnatically inFig. 8 wherein the heat waves en'ianating from the resistance wire areindicated by the series of: arrows It and are shown as being reflectedat B by the reflector lace of the member 10, and the action of themember 16 as a ballle is indicated by the series of arrows C. Theradiant heat at this part of the shell, therefore, is increased by theheat thrown down from the resistance wire as well as that thrown upward,presenting a space wherein the radiant heat is con centrated as asubstantially circulararea D.

(Fig. 10.)

In the rectangular portion (3 of the shell, be generated heat is in theform of a relnarrow ehangated strip or sheet of heated air, indicated atE, in Figs. 9 and it).

In Fig. this dianrauuna 9 l have atten'ipted to illustrate lically bythe several series in this ligure, the arrows F inrisin'r currents o'lair which will be as they pass the resistance unit and 1 ica'leil by thearrows group F in Fig. l). he outside arrows (l in said ll,?,lli'(indicale currents of air rising through the base which will not behealed appreciably, but the eliect of which will be to localize theconcmitration of the heated strip or sheet indicated by the arrows F,will. the currents ol air indicated by the arrows ll in Fig. 9, andwhich represent currents ol air coming; up over the outer edges of therectangular part (3 oi the shell.

From the foregoing (flescription it will be e 'ident that I providethree zones of heal application, viz, the zone I) of wide distribution,which is produced by the radiant heat given oil by the resistance wireabout the prared portion 12 and reflected baclc by the reflector faceor? the asbestos ballle member 16, which ineinber however acts toprcvcrl' any appreciable rising column of heated air from passing:through the part 5 of the casting; the relatively inn-row. elongatedzone I) of concentrated heat application which is produced by the risingcohunn of heated air bounded on edges by an ascending column of cool aircarried along by the heated air: and the none or hot spot 7 ol intenseheat application lying: between the zones D and E Various nmdificationsin the con truction and operation of my dc ice may obviously be resortedlo, all without departing l roin the spirit of my invention it withinthe limitv of the appended claims,

lllil What I therefore claim and desire to secure by Letters Patent is:

1. In a heater of the class described, a frame and a hea'ting'el'ementassociated therewith and constructed and arranged to supply a restrictedzone of convected heat and an adjacent enlarged zone of radiant heat,there being a space intermediate of said zones constitutinga limitedarea of intense heat application.

2, In a heater of the class described, a base, a superposed shellpresenting an enlarged areaand an adjacentrestricted area, a combinationbattle and reflector withi said enlarged area, and a heating elementassociated with said shell and effective within said enlarged areathereof to produce a zone of wide heat radiation within which the balileacts to prevent any appreciable column of rising heated air andeffective withinwsaid restricted area of the shell to produce a zone oflocalized heat convection bounded and concentrated on its edges by anascending column of cool air.

3. In a heater of the class described, a base, a superposed shellpresenting an enlarged area and an adjacent restricted area, acombination baffle and reflector within said. enlarged area, andaheating element associ ated with said shell and effective within saidenlarged area thereof to produce a zone of wide heat radiation withinwhich the baflle acts to prevent any appreciable column of rising heatedair and effective within said restricted area of the shell to produce azone of localized heat convection bounded and concentrated on its edgesby an ascending column of cool air, there being a space intermediate ofsaid zones constituting a limited area of intense heat application.

4-. In a heater of the class described, a base, a superposed shellpresenting an en larged generally circular area and an adjacentrelatively narrow area, a combination baffle and reflector within saidenlarged area, and a heating element associated withsaid shell andeffective within said circular area thereof to produce a zone of wideheat radiation within which the baffle acts to prevent any appreciablecolumn of rising heated air and effective within said narrow area of theshell to produce a zone of localized heat convection bounded andconcentrated on its edges by an ascending column of cool air.

5. In heater of the class described, a base. a superposed shellpresenting an enlarged generally circular area and an adjacentrelatively narrow area, a combination battle and reflector within saidenlarged area, and a heating element associated. with said shell andeffective within said circular area thereof to produce a-zone of wideheat radiation within which the baiiie acts to prevent any appreciablecolumn of rising heated air and effective within said narrow area of theshell to produce a zone of localized heat convection bounded andconcentrated on its edges by an ascending column of cool air, therebeing a space intermediate of said bodies of heat constituting alimitedarea of intense heat application. 7

in a heater of the/class described, a base and a superposed shellpresenting a generally circular area and an adjacent elon gatedrelatively narrow area, a heating element associated with said shell andpresenting adjacent saidenlarged area a surface of wide heat dispersionand adjacent said relatively narrow area a surface of localized heatdispersion, an insulated mounting for said heating element consisting ofa pair of insulating strips disposed side by side longie tudinally ofsaid elongated area and sepa-, rated and bent upon themselves withinsaid circular area to present an enlarged heating surface generallyapproximating the interior configuration of said enlargedarea of theshell.

7. In a heater of theclass described, a base and a superposed shellpresenting a generally circular area and an adjacent elongatedrelatively narrow area, a heating element associated with said shell andpresenting adjacent said enlargedarea a surface of wide heat dispersionand adjacent said relatively narrow area a surface of localized heatdispersion, said areas at their juncture defining a limited area ofintense heat application, an insulated mounting for said heating elementconsisting of a pair of insulating strips disposed side by sidelongitudinally of said elongatedarea and separated and bent uponthemselves within said circular area to present an enlarged heatingsurface generally approximating the interior configuration of saidenlarged area of the shell.

8. In a heater of the class described, a base and a superposed shellpresenting a generally circular area and an adjacent elongatedrelatively narrow area, a heating element associated with said shell andpresenting adjacent said enlarged area a surface of wide heat dispersionand adjacent said relatively narrow area a surface of localized heatdispersion, said areas at their juncture defining a limited area ofintense heat application, an insulated mounting for said heat ingelement consisting of a pair of insulating strips disposed side by sidelongitudinally of said elongated area and separated and bent uponthemselves within said circular area to present an enlarged heatingsurface generally approximating the interior configuration of saidenlarged area of the shell, and a combination bafiie and deflectordisposed within said enlarged area and having a cutout disposed towardssaid area of heat appli cation of concentrated intensity.

9. In a heater of the class described, a base and a superposed shellpresenting an en larged area and an adjacent restricted area, a heatingelement associated With said shell, and an insulated mounting for saidheating element consisting oil a pair of insulating strips disposed sideby side longitudinally Within said restricted area and separated andbent upon themselves Within said enlarged area to present an en argedheating surface generally approltiinating the interior configuration oisaid enlarged area of the well.

10. In a heater of the class described, a

base and a super 'iosed slell presenting an enlarged area and anadjacent restricted area, said area at their juncture defining a limitedarea or intense heat application, heating eleu'ient and a combinationbattle and deflector disposed Within said enlar ed a 'ea and having acutout disposed towards 'd are. of heat application of concentratedintensity.

11, In a heater oi the class described, a base and a superposed shellpref ntinp' an enlarged area and an adjacent restrieti-al area, saidareas at their juncture defining a limited area oil. intense heatapplication, 2 heating element associated with said shell.

12, In a heater ol? the cla described, 2 frame having an elongatedportion and an adjacent enlarged portioin and a heating elementassociated with said ii ranie and presenting an elongated portioncooperating with said elongated portion oi the 'lraine to supply arestricted zone of convected heat associated with said shell,.

and presenting an adjacent enlarged portion cooperating with saidenlarged portion of the frame to supply an adjacent enlarged zone ofradiant heat.

3. In a heater of the class described, a frame having a narrow elongatedportion ano an adjacent suhstantially circular portion, and a heatingelement associated with said. frame and presenting a narrow elongatedportion cooperating with said elongated portion of the frame to supply arestricted Zone or coniected heat and presenting an adjacentsubstantially circular Pt "tion cooperatingwith said substantiallycircular portion ol the frame to supply an adjacent substai'itiallycircular zone of radiant heat and a combination bulileand reflectormember within said generally circular mne.

in a heater ot' the class described, a frame having a narrow elongatedportion and an adjacent substantially circular por Lion, and a heatingelement associated with said frame and presenting a narrow elongatedportion cooperating with said elonga ed portion of the frame to supply ar ricted zone oi conrected heat and present 3; an adjacent substantiallycircular portion cooperating with said substantially circular portion ofthe frame to supply an adjacent substantially circular zone of radinoheat.

in testimony whereof I atlia my signature.

EDTVARD J. OVINGTON.

